电话机出现铃声变调、声音尖叫的故障,除了极少数是蜂鸣器、扬声器故障外,绝大多数都是振铃集成电路出现故障。对于以集成电路CS9106为核心的振铃电路,除了用相同型号的集成电路更换外,还可用WE9105、ML8204、KA2410等代换。若用价格相对便宜的KIA6401,需对原电路 Ringing tones tone phone, voice screaming fault, except for a very few buzzer, speaker failure, the vast majority of ringing integrated circuit failure. For the integrated circuit CS9106 ringing circuit, in addition to using the same type of integrated circuit replacement, but also with WE9105, ML8204, KA2410 substitution. If the price is relatively cheap KIA6401, the need for the original circuit